Lee-W opened a new issue, #68238:
URL: https://github.com/apache/airflow/issues/68238
### Body
Segment-based (categorical) partitions — static sets
Categorical asset partitions whose key set is **declared statically at
authoring time** (fixed regions / jurisdictions / known variants). Both
cardinalities:
- **n-1 (rollup)** — fold a fixed segment set into one downstream run:
`RollupMapper(upstream_mapper=FixedKeyMapper("all_regions"),
window=SegmentWindow(["us","eu","apac"]))` (mapper/window primitives landed;
release semantics via wait policies, #66848.)
- **1-n (scatter)** — fan one upstream event out to a fixed segment set:
`FanOutMapper(upstream_mapper=IdentityMapper(),
window=SegmentWindow(["us","eu","apac"]), downstream_mapper=...)`
`SegmentWindow` is the shared primitive for both directions;
`FixedKeyMapper` supplies the rollup bucket. (Supersedes the earlier
`AllowedKeyMapper([...])` sketch.)
### Committer
- [x] I acknowledge that I am a maintainer/committer of the Apache Airflow
project.
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